Machine for trimming sole margins



May 20, 1930. P. ,1. WENTWORTH IIACHINE FOR TRIMMING SOLE MARGINS Filed Aug. 9, 1926 2 Sheets-Sheet 1 I as. ii.

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May 20, 1930. P. J. WENTWORTH MACHINE FOR TRIMMING SOLE MARGINS 2 Sheds-Sheet 2 Filed Aug. 9, 1926 awuemtoz W am "up 7 F q M w 6 4 w W z a, w w J a Z a 1., 8 .m a

Patented May 20, 1930 I if rEnnL .iosmfn wnn rwonrrn, onfnonrirnoiims KE TUCKY,

" M'Acmnn" non TRIMMING sons. MAnGINs Application .filedAugust 9, 1926. Serial No. 128,067.

1 This invention relates to improvements in shoe machinery and more particularlyto a machine for marginally trimming or scarhng a shoe sole before securing the sole to. the up-1 5 per to produce a uniform surfacefinishmar- I g nally on one slde of the sole.

The machine provides a pair of driven feed rolls between which the material or shoe sole is inserted and a stationary knife defi-' nitely set in relation to one of the rolls and movable as a'unit withsaid r-oll transversely to the direction of feed of thework to automatically position the cutter with respect to the surface of the work so that no change in setting of the cutter need be made for oper-v ating upon different pieces of work of varying thickness. The roll andfblade as a-unit are pressed upon the work and against the periphery of the second roll which prevents yond adetermined depth'cut. i

Therefore, an object of the invention is to thecutter' from digging into" the work beprovide a trimming or scarfing machine for trimming the margin-of one-side of a shoe sole to producea finishedface surface, the m'achine operating upon sole blanks of varying thickness without requiring a change in the cutter setting. l

Another object of the inventionis to provide an edge trimming or scarfing machine with a pair of feed rolls one of which is mounted for compressingly engaging the work inserted between the rolls to feed the same with the rotation of the rolls, and a sta tionary cutter mounted for movement as a unit with said movable-roll'toward and from the second roll, adapting the cutterto be automatically adjusted for operating upon: pieces of workof relatively different degrees of thickness through the introduction of the work between the rolls. A I "Other objects and certain advantages will be more fully set forth in the description of;

the accompanying drawings forming a part 4 of this specification in which:

Figure 1 is a frontviewsof' the cuttingmachine, certain portions thereof being shown in. section to illustrate'the. mounting ofithe varlous parts, I

I Figure 2 is a sectionalview taken on line 22 of Fig. -1, showing the gearing connec, tions between the feeding shafts and themanually operated shaft.

V Figure 3 is a sectional View on line 38 of Fig. 1, showing the means for raising/the 7 blade and the upper feeding member away from the lower support and feeding member when a shoe sole is'to be inserted. 5 Figure 4 is a sectional view takenonline- H of F ig.3 showing the relation of feed, 6 f

ing members and cutting element, and showing a shoe sole inserted in the mechanism with. the desired cut being made on the margin thereof.

Figure 5 is a sectionalview taken on 55 of Fig. 4 detailing the cutter element.

structure and showing the relation of the shoe sole to the tion. V V

Figure 6 is a view of the blade removed'm from the cutter element. V

Figure 7 is a view showing a form of sup port and feeding member for disposing the shoe sole edge at a proper angle to the cutter.

blade for the removal of a greater amount ofi'fa material therefrom. s I

Figure 8'is a front view of the cutter ele ment showing the relation of the guide memher to the base cutter blade. i

The invention herein is primarily directed so i to feeding and cutting instrumentalities for chamfering or trimming the edge of a leather, shoe sole in which astationary cutter is dis-. posed relatively to a pair of feed rolls for trimming the marginal surface or edge of the material, fed by and engaged between the rolls with the cutter mountedv for unit move-. ment with one of the rolls toward andfromw the second roll. The frame structure for supporting-the rolls and cutter and the trans- 9!);

blade during the scarfing opera-i 7 mission for rotating the rolls may be of any conventional form, the type herein illustrated being adapted tobe mounted upon a bench and comprisinga U-shaped frame formed of a base 1 and spaced uprights 2, 2 for sup j ournaling the several shafts porting and providing the transmission fOr the feed-rolls.

. right 2, t

The transmission is shown as hand-crank op erated'and comprises a driving shaft 3having a hand crank 4 fixed thereon at one end, The; shaft 3 also carries a gear 5 fixed thereon preferabl adjacent the inner-side of the uprelatively mounted on opposite sides of the upright'serving to securethe shaft within its bear ng against- "longitudinal displacement. The gear 5 is in mesh with the. gearS on an intermediate shaft 6,the shaft '6 at its outer end carrying one of the feed rolls, in this im stancethe lower feed roll. The gear 8 is also in mesh with the gear :9 on the driven shaft 7 disposed above the shaft 6 and'a shaft 7 carries a second or upperfeed roll.f This arrangement of gearing providesfor rotating the shafts 6 and 7 and their-feed rolls in rela-' tively opposite directions to. cooperate in feedingthe work engaged between the rolls} The shafts6 and 7 at their outerends are c-provided with collars 10-10 for securing the shafts within their bearings against-longitudinal displacement.

The uprightsare shown as of sectional form V and for the upright 2, comprising a'pair of I spaced vertical post's',1111 between which the bearlngs 12=are secured, the bearings being secured'in place'by' means of screws 13 -engaged through and into thevertical posts 7 1111 and the posts are secured together by. means of the bolts 14. Regarding the up-' right 2 its structure is similar to that ofthe upright 2 excepting thatthe lower bearing block 15 journaling theishaft 6 is rigidly secured by a screw '19 and the upper bearing 16 is vertically slidably mounted between the; posts '17. i f- The forwa d ends of the shafts 6 and 7 I extend beyond the outer side ofthe upright 2 to which, respectively, the feed rollers 20 and-21 are fixed. The bearing 16m vertically movable for separating "orspacing the feed rolls to accommodate for various thicknesses soffmaterial and for yieldinglyu'rging the rupp er' roll 21 toward the lower roll 20 under the tension of a coil spring'22 seated within a socket formed in the bearing 16.7 One; end

of thecoil spring 22 is engaged about the free end of a rod 23-andfagainst a nut 25 screw-threaded upon the rod'23. The nut 25 is held against rotation by contact with the spring thereby providing means for adjusting the tension of the spring. The adjusting rod :3 23 isengaged through across piece 26 which connects the upper ends of the posts 17 of the 'fupright 2 and is provided with a handle 27 rwitb which'the rod can berotated relative to e gear 5 and crank handle 4 being nut for adjusting the tension of the spring. A collar 28 is pinned to the rod, this collar engaging the underside of the cross plece 26 for maintaining the rod against displacement relative to the cross piece. c.

To permit ele'vatingthe upper feed roll 21,

the'bearin'g block 12 in the upright 2 is hingedly'mounted by means of the screw 13 and the bearing block 16 is slidably mounted within its upright 2. Alever 3O pivoted-to the inner side of theupright 2 has its forward end en-' gaging the nnder side of the shaft 7 and its opposite end connects with an actuating rod which maybe treadle operated 'or otherwise i a so actuated for swinging the shaftand its parts;

The bearing block 16 is limited-in its downward movementvbyengagement againstan adjustable' abutment 'serving" to limit the depth cutofthe knife sustained upon the a hearing block. The abutment comprises a screw 32 threaded into the'fixedbearing' block 15 with the head of the screw bearing against a cutter holder clamp 39 mounted upon the 1 lower sideof the bearing block 16. For ini serting. the" work between the feedrolls the lever 30 is actuated'to elevate ithe feed roll 21' whereupon after the work hasb'eeninserted the lever is released bringing the upper, roll" 21 upon the material under spring tension, so' that when the rolls are rotatedthe work or material will be appropriatelycfed due to its frictional engagement with the rolls. The l V slide block 16-is held laterally against displacement by across bar 35-, which connects i ,I 9 A cutter holder 36 is secured within the, clamp 39 on the under side of the bearing the posts of the upright.

block 16 withits forward end arranged and extended to provide a guide for the material between the'rolls and'a base for suitably sup-V portinga stationary cutter or blade 37 hava ing its cutting edge extending over the lower feed roll and adjacent the inner edge of the upper feed roll. I The holder is provided with a-shank 38 engaged within"theclamp block 39 fixed to the under sidefof the bearing block 16, the clamp block; 39 being of any sectional. 7

form and adapted to frictionally clamp the shank of the holder which vis preferably of square formlof cross section,the sections of:

the clamp beingheldrtogether byfmeansof a adjusting the cutting angle of the blade relative 'to the work. The cutting edgeyof the blade extends radially with respect to the axis of the cutter and is inclined upwardly for obtaining an appropriate bevel trim to the material passed across the cutter. The cutting edge also is slightly skewed to advance the point end of the blade and present ing its cutting edge to the work to obtain a shear or draw action as. the work is fed against the cutter.

The forward edge of the holder is preferably curved and serves as a guide for the edge of the work this edge being indicated at 4:8. The holder of the cutter is also provided with a guide lip 49 engaging over the upper marginal edge of the work to guide the same downwardly or hold the same against any upward drawing tendency under the action of the knife as the work is fed. This guide or pressure lip 19 is adjustably mounted upon the holder having a dove-tailed connection with the cutter holder for adjusting the same vertically and frictionally held in its adjusted position by means of a screw 50 engaged through and into split portions of the holder. The cutter being fixed to the bearing block 16 unitarily combines with the roll and therefore bears a definite relation thereto, so that no relative adjustment need be made for any change in thickness in sole material tobe trimmed unless it is desired to change the degree of chamfering or angle of the out. As the gauge thickness for soles varies considerably no setting need be made for each thickness of material, the primary feature being to trim the margin preferably from the flesh side to produce a uniform depth of cut. The edge thickness of one sole to another varies according to the gauge thickness of'the different stock used, which generally is immaterial, the edge marginal trimming being preferably for the purpose of giving finish to the flesh side and provide a margin over which the shoe upper can be appropriately applied, for such types of shoe in which the sole does not extend materially beyond the upper and for other types to provide a face surface which will not require trimming after the upper is applied.

Another form of lower feeding member is shown in Figure 7 When it is desired to make a greater degree of chamfering cut, the rotary member 51 is substituted for the member 20. A portion 52 of the member 51 at the inner side thereof is of increased diameter. The member 51 is mounted in the same relation to the upper rotary members as member 20, but due to the increased diameter portion 52, the edge of the sole is turned upwardly slightly and more into the blade resulting in a greater degree of chamfering. This type of feeding member is used when an extremely sharp chamfer is desired, otherwise blades having cutting edges of varying degrees of inclination are used as in the previously described form.

of the upper to have the cutter over-lie the 4 margin of thework bearing upon the an tended portion of the lower roll, so that the cutter as well as the roll compressively engages the work upon the lower roll. This provides a support for the work for the full degree of the cut. The cutter being movr ably mounted with the upper roller cannot be depressed beyond a depth allowed by the upper roll through its contact upon the work and this insures trimming the work to a uniform edge thickness governed by the thickness of the work. For the margin or edge trimming of the sole, it is only required that the margin surface of the flesh side be uniformly trimmed. edge does not necessarily have to correspond in measurement to that of the second sole, so that no knife setting need be made for the varying thicknesses of material for a given range. The trimming is primarily to give finish and appearance to the edge of the sole rather than utility, and the finish is materially marred if the varying trimming presents an undulating or wavy-like appearance.

The thickness of the sole.

With the marginal edge of the work substantially supported it can be drawn across the cutter for skiving off a uniform amount irrespective of the thickness of the stock.

Having described my invention, I claim:

1. In a device of the class described, a frame, a pair of rotary feeding elements having opposing peripheral surfaces, one of the feeding elements being of less width than the other and adjustable in relation thereto, a cutter holder adjustable with and having a blade disposed at the side of the narrow faced feeding element and above the peripheral surface of the broad faced rotary element, the wide faced rotary feeding element having an increased diameter portion beneath the blade for directing the material edge inserted between the rotary elements upward into the blade for removal of a greater quantity of material from the margin.

2. In a device of the class described, a pair of driven rolls, said rolls peripherally opposed, one thereof journalled for movement relative to the second roll, means for urging said first roll toward the second roll, a cutter holder mounted in fixed relation to the first relative to the second roll, means for urging said first r011 toward the 'second roll, a cutter holder mounted in fixed relation tothe first r011 and movable therewith, a cutter 'mounted on said holder and having its edge disposed over the surface of the second roll, and a guiding element engaging the Work in 7 advance of the cutter for'holding the Work firmly againstthe lower r011,

In :witness whereof, I hereunto subscribe my name.

PEARL JOSEPH WENTWORTH. 

